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Characteristic of heat pump thermo ON/OFF under tank side condition
Water Outlet Thermo condition
o Heat pump THERMO OFF TEMP:
1. Heat pump THERMO OFF TEMP = 53°C + [+4°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump OFF
and water pump continue ON.
o Next THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet when heat pump THERMO OFF + [-3°C].
2. If water outlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Water Inlet Thermo condition
o Heat pump THERMO OFF TEMP
1. Water inlet temperature > [55°C] for continuous 30 seconds, heat pump OFF, water pump continue ON.
o Next THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet temperature <55°C.
2. If water inlet temperature < THERMO ON TEMP AND External Room Thermo OFF, heat pump ON.
Solar Operation Condition (Only during solar priority is set condition)
o When solar request ON, solar valve will ON, turn OFF heat pump and water pump and switch 3 ways valve to
room side.
o THERMO ON TEMP:
1. THERMO ON TEMP = Heat pump tank target temperature + [-2°C].
2. If tank temperature < THERMO ON TEMP AND External Room Thermo OFF AND Solar 3WV OFF, switch
to tank side. Turn ON heat pump after water pump turns ON for 3 minutes.
3. Backup heater control:-
o During External Room Thermo ON time, follow normal backup heater control operation.
o During External Room Thermo OFF time, Backup heater OFF.
4. Booster heater control:-
o Booster heater ON/OFF follow normal operation.
* Under solar priority is set condition, when solar 3 way valve is ON, booster heater turn OFF.
5. Solar 3 way valve:
o Solar 3 way valve operates follow solar operation specification.
* Under solar priority is et condition, when solar 3WV turns ON, booster heater will turns OFF and 3 ways valve
switch to room side.
* Under solar priority is not set condition, solar 3WV will OFF when heat pump operate to tank side.
o 2 way valve open.
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